title: An outbreak of paratyphoid A in Singapore: clinical and epidemiological studies.
abstract: The epidemiological and clinical findings of 61 cases of laboratory-confirmed paratyphoid A reported in an outbreak in 1979 were described. Epidemiological investigations of 42 indigenous cases implicated imported fresh oysters as the vehicles of transmission (p less than 0.01). Although S. paratyphi A could not isolated from the implicated oysters, several observations presented tend to support the association between oyster consumption and illness. The clinical features were similar to typhoid, 82.8% of the organisms were isolated from blood cultures. The relapse rate was 8.6%. There were three stool and one urinary convalescent carriers. Two of the stool carriers were treated with cholecystectomy.
mesh_terms: D000293:Adolescent; D000328:Adult; D002353:Carrier State; D004196:Disease Outbreaks / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D010284:Paratyphoid Fever / Q000175:diagnosis / Q000188:drug therapy / Q000453:epidemiology*; D012482:Salmonella paratyphi A / Q000302:isolation & purification; D012846:Singapore